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Release 3.21.7 (2026-07-15)

Performance improvement

nix search is slightly faster when using parallel evaluation. PR: DeterminateSystems/nix-src#564

Bug fix

We improved on a bug fix in the previous release to prevent crashes in OpenSSL when Nix exits. PR: DeterminateSystems/nix-src#566

Full Changelog: v3.21.6...v3.21.7